The Dangers of Heat-Affected Zones in Collision Repairs

Whenever welding or cutting is performed, the metal around the weld becomes a heat-affected zone (HAZ). In modern vehicles, this can be dangerous if not carefully controlled.

At Solon Collision, we understand how heat changes the strength and durability of high-strength steels and aluminum, and we take every precaution to prevent unsafe repairs.

What Is a Heat-Affected Zone?

A heat-affected zone is the section of metal around a weld that is exposed to elevated temperatures but not melted. In this zone, the metal’s structure changes, which can:

• Weaken strength

• Make it brittle

• Reduce crashworthiness

Why HAZ Is a Problem in Modern Cars

Older mild steel was more forgiving, but today’s materials like UHSS and aluminum are extremely sensitive to heat. OEMs often prohibit heating above certain levels or require complete part replacement instead.

If a technician ignores these guidelines, the repaired section may fail in another collision.

Preventing Heat Damage

At Solon Collision, we:

• Use OEM-approved welders with controlled heat input

• Follow manufacturer instructions for each weld type

• Avoid unnecessary cutting or grinding in sensitive areas

This ensures repairs maintain the integrity of the original structure.

FAQs About Heat in Collision Repair

Why can’t shops just “heat and beat” like they used to?

• Because advanced metals lose their strength permanently when overheated.

Is this really a safety issue?

• Yes. An overheated B-pillar or roof rail could fail in a crash.

Do all shops follow these rules?

• Unfortunately, no. That’s why choosing the right shop matters.

Final Thoughts

Heat-affected zones are a hidden risk in collision repairs. At Solon Collision, we take the time and care to ensure your vehicle is repaired properly — no shortcuts, no unsafe heat use.

📞 Call 440-903-1009 or visit 260 Lena Drive, Aurora, OH 44202 for OEM-compliant repairs.